Methodology: How BisonVsBuffalo Verifies Sources 2026

Primary sources

Every numerical figure, species claim, and conservation-status assertion on the site traces back to a named primary source. The table below lists the authorities used, what the site takes from each, and the cadence at which each is reviewed.

Source	Cadence	What we take from it
IUCN Red List of Threatened Species	On annual republish	The IUCN Red List is the primary source for conservation status on every species page. Each species profile cites the current IUCN listing: American bison (Bison bison, Near Threatened, Aune et al. 2017), European bison or wisent (Bison bonasus, Near Threatened, Plumb et al. 2020), Cape buffalo (Syncerus caffer, Least Concern with declining trend), and wild water buffalo (Bubalus arnee, Endangered). Where IUCN status revises, the site updates within the next monthly review.
IUCN SSC Bison Specialist Group	On revision	The Bison Specialist Group within IUCN's Species Survival Commission is the authoritative source for the global bison conservation framing across Bison bison and Bison bonasus. The site references the BSG for population estimate ranges, captive vs conservation vs commercial-herd framing (~20,000-30,000 conservation animals vs ~430,000-500,000 commercial in North America), and the Wood Bison Recovery context in northern Canada.
US National Park Service	On revision	NPS is the primary source for Yellowstone bison census (~5,000 in recent years), plains vs wood bison framing within US protected lands, and the safety guidance (25-yard / 23-metre minimum viewing distance) referenced in the /about and /methodology corrections-process callouts. The site cites NPS for the Wood Buffalo National Park (Canada, ~5,000 individuals across plains and wood-bison stocks) and for the Custer State Park and Wind Cave herds.
US Fish and Wildlife Service	On revision	USFWS is the federal authority on the Bison Conservation Initiative across US Department of the Interior land, the Wood Bison Recovery framework (working with Canadian counterparts), and federal regulations around interstate transport of bison. The site cites USFWS for the conservation-herd counts and for the recovery-trajectory framing from fewer than 1,000 individuals in the 1890s to today.
Wildlife Conservation Society	On revision	WCS publishes long-term field studies on Cape buffalo and wild water buffalo populations across sub-Saharan Africa and South / Southeast Asia. The site cites WCS for Cape buffalo population framing in protected areas like Serengeti and Kruger, and for the wild water buffalo (Bubalus arnee) studies in Kaziranga, Manas, and the Koshi Tappu Wildlife Reserve in Nepal.
Smithsonian National Zoo	On revision	The Smithsonian National Zoo's animal-facts pages are cross-referenced for behavioural and ecological context, particularly for the American bison reintroduction history and the Plains Bison Conservation Initiative led with the Inter-Tribal Buffalo Council. Smithsonian publications are also consulted for the historical context of the 19th-century near-extinction.
San Diego Zoo Wildlife Alliance	On revision	SDZWA publishes vetted species fact sheets covering all four bovid species on this site. The site cross-references SDZWA for life-history data (lifespan, gestation, calf-rearing, social structure) and ecological framing. Where SDZWA framing differs from a peer-reviewed source, the site mirrors the peer-reviewed source and notes any material divergence.
Food and Agriculture Organization (FAO)	On annual republish	FAO FAOSTAT is the primary source for domestic water buffalo (Bubalus bubalis) population data. The site cites FAO 2022 figures: ~208 million domestic water buffalo globally, with the largest populations in India (~109 million), Pakistan (~38 million), China (~27 million), Nepal (~5 million), Egypt (~4 million), and an Italian population of approximately 400,000 managed for buffalo mozzarella production. Updated on FAO's annual republication cycle.
Britannica	On revision	Britannica is cited for taxonomic and etymological framing (the Bovidae family, the Bovini tribe, the Bison-Syncerus-Bubalus generic split, and the four-century history of the bison-as-buffalo naming error from the 17th-century French boeufs through Carl Linnaeus 1758 and Hamilton Smith 1827 to the National Bison Legacy Act 2016). Where Britannica framing differs from a peer-reviewed source, the site mirrors the peer-reviewed source.
Peer-reviewed mammalogy journals	Monitored quarterly	Journal of Mammalogy (American Society of Mammalogists), Journal of Zoology (Zoological Society of London), and Acta Theriologica are monitored quarterly for new measurement studies, taxonomic revisions, and population assessments. Where a new peer-reviewed measurement supersedes an existing site figure, the affected page is updated and the LAST_VERIFIED_DATE rolled forward.
Wikimedia Commons (Public Domain photography)	On revision	Where photography appears on the site, it is sourced as Public Domain or Creative Commons licenced material from Wikimedia Commons with attribution to the photographer and licence noted under each image. No copyrighted or rights-managed imagery is used.

In scope

+Bison vs buffalo disambiguation across the four bovid species: American bison (Bison bison), European bison or wisent (Bison bonasus), Cape buffalo (Syncerus caffer), and water buffalo (Bubalus bubalis with wild Bubalus arnee). Six-factor field identification on /identification.
+Per-species conservation status from the current IUCN Red List assessment, with population estimates where the underlying data is published (e.g. ~5,000 Yellowstone bison per NPS; ~208 million domestic water buffalo per FAO 2022; fewer than 4,000 wild Bubalus arnee per IUCN).
+Population data and historical recovery trajectory: NPS Yellowstone bison census, USFWS Bison Conservation Initiative and Wood Bison Recovery, the IUCN SSC Bison Specialist Group's broader bison framing, and the Wildlife Conservation Society's wild water buffalo field studies.
+Geographic range and habitat from NPS, IUCN, WCS, and the relevant national park authorities. Why the four species' wild ranges have never overlapped historically.
+Etymology and taxonomy: the four-century vernacular drag of bison-as-buffalo from 17th-century French boeufs through Hamilton Smith 1827 to the National Bison Legacy Act 2016. Cross-referenced against Britannica, Smithsonian, and the peer-reviewed mammalogy literature.
+Cultural framing: Plains Indian relationships with bison (Lakota, Blackfoot, Cheyenne, Comanche); the Inter-Tribal Buffalo Council restoration work; the 1913 US Buffalo Nickel as the most famous embodiment of the coin-era misnaming; African and South Asian cultural framings.
+Travel and wildlife-viewing context: identifying ethical viewing locations (Yellowstone, Wood Buffalo NP, Kruger, Kaziranga) with NPS-derived safety guidance and seasons.

Out of scope

xLive attack alerts, real-time animal tracking, or any service that would require operational on-the-ground intelligence. The site is a reference, not a live wildlife information service.
xBison ranching advice, husbandry guidance for ranched bison or domestic water buffalo, or veterinary care for captive bovids.
xHunting framing, trophy ranking, or any content that would support recreational or commercial harvest decisions.
xTour booking, real-time availability, or guarantee of wild sightings. The /where-to-see page identifies locations and notes seasons; it is not a bookings service.
xTaxonomic revision proposals. Where current taxonomy is contested (e.g. the Bubalus arnee vs Bubalus bubalis arnee species-vs-subspecies framing for wild water buffalo), the site notes the disagreement and follows the most recent IUCN consensus.
xInvestment, agricultural-economics, or commodity-pricing analysis for the bison meat or water buffalo dairy markets. Site references domestic populations and the existence of these markets only for editorial context.

Verification framework

Field identification (6-factor)

Field ID uses shoulder hump (pronounced in bison, absent in both buffalo species), horn shape (short upward C-curve in bison; fused boss with downward-then-upward sweep in Cape buffalo; long backward-and-upward crescent in water buffalo), beard and coat (heavy mane and beard in bison, sparse in both buffalo species), head position (low-slung in bison, held higher in Cape; mid-position in water buffalo), coat colour and texture, and geographic range (North America for bison, sub-Saharan Africa for Cape, South and Southeast Asia for water buffalo). Where a single cue is ambiguous, the six-factor combination resolves correctly.

Conservation status (IUCN Red List only)

Every conservation-status assertion (Least Concern, Near Threatened, Vulnerable, Endangered) traces to the current IUCN Red List listing. Where local management (e.g. USFWS) classifies a species differently from the IUCN listing, the site reports both and explains the divergence. Where IUCN re-assesses a species, the site updates within the next monthly review.

Population figures (NPS / USFWS / FAO primary)

American bison population data traces to NPS Yellowstone census and USFWS Bison Conservation Initiative for conservation-herd counts, with commercial-herd estimates derived from the IUCN SSC Bison Specialist Group and the National Bison Association. Cape buffalo population framing traces to IUCN Red List with WCS as a secondary source for protected-area counts. Wild water buffalo (Bubalus arnee) traces to the IUCN 2019 assessment (fewer than 4,000 mature wild animals). Domestic water buffalo (Bubalus bubalis) traces to FAO 2022 FAOSTAT (~208 million globally).

Etymology and history (Britannica + OED + Smithsonian)

The 400-year bison-as-buffalo naming history is cross-checked against Britannica, the Oxford English Dictionary's etymology of buffalo (from Late Latin bufalus via Portuguese and French), the Smithsonian National Museum of American History's framing of the 1913 Buffalo Nickel, and the National Bison Legacy Act 2016 official text. The site explicitly resolves the vernacular-vs-scientific tension (the popular American name is buffalo; the scientific name is bison; both refer to the same North American animal Bison bison).

Refresh cadence

The IUCN Red List is checked on annual republish (typically late autumn for that calendar year's reassessments) and at the next monthly review cycle. NPS Yellowstone bison census is reviewed on annual republication. USFWS Bison Conservation Initiative pages are reviewed on US-specific updates. FAO FAOSTAT domestic water buffalo population data is checked on the annual republication cycle (typically each Q4). Wildlife Conservation Society and IUCN SSC Bison Specialist Group are reviewed on publication. National Geographic, Britannica, San Diego Zoo Wildlife Alliance, and Smithsonian National Zoo are reviewed when their species pages republish.

The verification date is held in a single constant (LAST_VERIFIED_DATE in src/lib/schema.ts) imported by every page. Footer text, schema dateModified, hero badges, the disclaimer banner, and the visible review timestamps all read from that single source so cosmetic refreshes are not possible without a content review. The current verified label reads May 2026.

Out-of-cycle refresh triggers: an IUCN status revision; a new peer-reviewed population, range, or taxonomic study in Journal of Mammalogy, Journal of Zoology, or Acta Theriologica; a recorded population shift in an IUCN SSC Bison Specialist Group newsletter; an NPS or USFWS rule change affecting bison conservation; a FAO FAOSTAT republication that materially shifts the domestic water buffalo numbers; a flagged correction submitted via the corrections process.

Limitations

!American bison conservation-herd vs commercial-herd counts depend on annual surveys whose methodologies vary across jurisdictions. The site reports ranges (~20,000-30,000 conservation; ~430,000-500,000 commercial) rather than point estimates to reflect the underlying uncertainty.
!Wild Bubalus arnee population figures are floors, not ceilings. Genetic studies suggest that truly-pure wild water buffalo (with no recent feral-domestic introgression) may number 2,000-3,000 individuals or fewer; the IUCN Endangered listing is based on the broader wild count of fewer than 4,000.
!IUCN Red List assessment lags real-time population shifts. Where a species is undergoing rapid population change (e.g. the European wisent recovery), the current IUCN status reflects the most recent formal assessment, not the live population.
!Species range descriptions on the site are simplified for editorial use. The actual range of each species is patchy and varies seasonally; the site identifies the principal regions but does not claim complete distribution mapping.
!Taxonomy is occasionally revised. The site treats Bison bison and Bison bonasus as separate species per current IUCN; the wild vs domestic water buffalo split (Bubalus arnee vs Bubalus bubalis) is treated per the IUCN convention rather than the older single-species framing.

Corrections process

We correct factual errors promptly when identified. To submit a correction, email Digital Signet with the specific URL, the disputed claim, and the primary source you want the claim verified against. We aim to respond within 5 business days with either a correction (where the source supports the dispute) or an explanation (where the existing wording is correct).

Where a correction changes the substance of a factual claim, we note the change and the date on the affected page. The site LAST_VERIFIED_DATE is rolled forward only when a substantive review against the cited primary sources has occurred, not for cosmetic edits.

Do not email about a wildlife emergency

If you are dealing with an aggressive bison in a US national or state park, call 911 or the park's emergency dispatch line. The NPS-defined safe viewing distance for bison is 25 yards (23 metres). For attack reports or injured wildlife outside a park, contact your state Department of Fish and Wildlife or the equivalent national wildlife authority. This site is a reference and does not provide live response or triage.

Methodology